Hexadecyl dihydrogen phosphate

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Remarks:

Test report does not contain full details of procedures followed. Results all present with graphs

Justification for type of information:

The substance that has been tested for this end point is the potassium salt of the hexadecyl dihydrogen phosphate. Once in solution, the potassium ion will dissociate from the substance leaving the hexadecyl hydrogen phosphate anion as the organic species that will undergo biodegradation. This is the same as the substance under consideration and thus read-across is considered totally valid.

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)

GLP compliance:

yes

Remarks:

According to the QA report, this study was carried out using generally accepted Good Laboratory Practices

Specific details on test material used for the study:

Cola Fax CPE-K Lot# 33098b12

Oxygen conditions:

anaerobic

Inoculum or test system:

activated sludge (adaptation not specified)

Details on inoculum:

Source: Mattabasset Waste Water Treatment Plant, Cromwell, CT
Treatment given: Aeration
Preconditioning: None
Concentration in reaction mixture: 1 mg/l

Duration of test (contact time):

28 d

Initial conc.:

3.33 mg/L

Based on:

test mat.

Initial conc.:

2.116 mg/L

Based on:

ThOD

Parameter followed for biodegradation estimation:

O2 consumption

Reference substance:

benzoic acid, sodium salt

Key result

Parameter:

% degradation (O2 consumption)

Value:

> 60

Sampling time:

10 d

Key result

Parameter:

% degradation (O2 consumption)

Value:

> 60

Sampling time:

28 d

Validity criteria fulfilled:

yes

Interpretation of results:

readily biodegradable

Conclusions:

ColaFax CPE-K Lot#33098b12 would be considered as readily biodegradable, reading 60% ThoD within a 10 day window from 10% ThoD.
Results for the reference (sodium benzoate) and toxicity controls were acceptable.

Description of key information

This substance would be considered as readily biodegradable, reading 60% ThoD within a 10 day window from 10% ThoD.

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

The substance that has been tested for this end point is the potassium salt of the hexadecyl dihydrogen phosphate. Once in solution, the potassium ion will dissociate from the substance leaving the hexadecyl dihydrogen phosphate anion as the organic species that will undergo biodegradation. This is the same as the substance under consideration and thus read-across is considered totally valid.